dynamic

The opposite of "static". When peoplethink about the future they usually do it from one of two perspectives. The first is that the future is static, like a mental image of Disney's Tomorrowland.
The second way of looking at the future is in a dynamic way, where we see the future as an evolution that is really an infinite series. Some people, mostly christian conservatives, see this as very threatening.

Also used in reference to friction that counters a constant energy source. Dynamic friction is why we need to continue to supply energy to our cars after they have already reached the desired velocity; As opposed to static friction, where energy is supplied only once per instance to put an object into initial motion.